package model;


import com.mysql.cj.jdbc.MysqlDataSource;
import com.sun.corba.se.pept.transport.ConnectionCache;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

// 和数据库建立链接
public class DBUtil {
    private static final String URL = "jdbc:mysql://127.0.0.1:3306/java102_blog?characterEncoding=utf8&useSSL=false";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "70770";

    private volatile static DataSource dataSource = null;

    private static DataSource getDataSource() {
        if(dataSource == null) {
            synchronized (DBUtil.class) {
                if(dataSource == null) {
                    dataSource = new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setUrl(URL);
                    ((MysqlDataSource)dataSource).setUser(USERNAME);
                    ((MysqlDataSource)dataSource).setPassword(PASSWORD);
                }
            }
        }
        return dataSource;
    }


    public static Connection getConnection() throws SQLException {
        return getDataSource().getConnection();
    }

    public static void Close(Connection connection, PreparedStatement statement, ResultSet resultSet){
        if(resultSet != null) {
            try {
                resultSet.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if(statement != null) {
            try{
                statement.close();;
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if(connection != null) {
            try{
                connection.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }
}
